I didn't watch due to timezone issues, but was hoping Djokovic would win for a couple reasons.
1. Slam race
2. They would never shut up about it if Federer won
If he had won it would be 21-21-19 currently, with a chance for Rafa to lead 22-21-19. In hindsight, it may have been preferable for it to be like that, but reason 2 has me not regretting my choice to root that way (even though I know it doesn't make a difference who I choose to root for).